The U.S. Army Corps of Engineers, Jacksonville District, has just released the Miami Harbor Deepening Project one-year post-construction assessment for hard-bottom middle and outer reef benthic communities.
The report includes data relevant to an assessment of temporary and permanent project effects at channel-side sites as per the Florida Department of Environmental Protection (FDEP) permit conditions for construction.
According to the Corps, the overarching goal of the monitoring plan is to assess status and trends of physical (e.g. sedimentation) and biological responses to construction activities.
Scientists compared the Miami Harbor project’s one-year post construction surveys with baseline surveys at 19 permanent monitoring stations located at channel-side locations and control sites. The FDEP identified the permanent monitoring stations.
The report focuses on impacts to channel-side hard-bottom communities, including corals, octocorals, sponges and other benthic invertebrates. Scientists studied thousands of photos and videos, and hundreds of hours of dive-time observations from more than 7,000 dives.
USACE is awaiting data relevant to potential effects of project sedimentation on hard-bottom communities outside the channel. Results are anticipated in late summer.
The report highlights:
Next Steps:
This is one of two assessment surveys for the project site. The other survey is designed to assess impacts that may have occurred farther afield than the channel side locations. The Corps is also conducting a sediment tracer study that is key to potentially drawing conclusions to the status and trends of the physical environment. Officials anticipate those study results in the fall.
Once all data collection and assessments are complete, the Corps will continue to work in partnership with FDEP and National Marine Fisheries Services to analyze the data and determine the permanent, as opposed to transient, effects of the deepening project, the success of the mitigation efforts, and the need, if any, for additional mitigation.